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essaitchthrowaway3 t1_jcc3ppx wrote

What does that gear do? It is too small to be transmitting a ton of torque, so I am assuming it is to transmit the speed or distance that has been traveled.

I would probably replace that gear with a 3D printed one because I think you will have a hard time finding a replacement.

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jeffersonairmattress t1_jccbtr2 wrote

It drives the speedo cable. It would be cheaper to grab a display and proximity sensor to count revolutions of the wheel than to build this gear. It has to be ridiculously tall-toothed to register in the perforated disc- looks like a 14.5 degree pressure angle and no longer a standard gear profile. Pretty easy to just bore a flat disc of delrin to the same OD and bandsaw&file the teeth- it doesn't need to be perfect.

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